Furnace roof



une 9,1925. y y 1,541,486`

B. DOBxE FURNACE ROOF Filed April 23, 1923 3 Sheets-Sheet l B, DOBIEFURNACE ROOF June 9, 1925. m 1,541,486

Filed April 23, 1923 3 Sheets-Sheet 2 lune 9. 1925. 1,541,486

- B. DOBIE l FURNACE ROOF Filed April 255, 1923- 3 Sheets-Sheet 3 l Z5Z/ Patented June 9, 1925.

y 1,541,486` PATENT oFEICE`.-T-*

BRADLEY DoBIE, or ELMHURsT, NEW YORK, AssIGNoR To AMERICAN ARCHjCOMPANY, A CORPORATION F DELAWARE.

FURNACE ROOF.

Application md April as, 1923." serial No. 633,906.

I of which the fdllowing is a specification.

' My invention relates to furnace roofs, and is especially concernedwith furnaces of cir` `cular form or the like,typiied'by oil stillfurnaces. Besides simplicity, relatively low cost and-facility'of'.construction, the pre-l ferredV embodiment of thev invention hereshown` affords the advantage of supporting the roof independently oftherefractory furnace lining or wall,-with .freedomjfonindependentexpansionl and contraction without lateral` stress or strain'onsuchwall,-` obviates allrisk of collapse of the roof, mininiizes spallingand other local deterioration, and allows the roof to be quicklyrepaired or replaced (in 'wholeor inv part) with the least trouble andexpense.; It also offers the advantage thatstandard parts (alreadycommerciallyV available) can be employed. v

How these and other advantages can be realized Ithroughthe invention ina novel manner `will appear from my description hereinafter of the bestconstruction for the purpose that is vknown to me.A

Inthe drawings, Fig. 1 fs a somewhat diagrammatic illustration of an oilstill furnace, in vertical mid-section as indicated'by the line 1-1 inFig. 2,.,with the intermediate portion broken out and omitted.

` Fig. 2 is a plan view of the furnace, with part of the actual roofomitted to make other features of construction clearer.

Fig. 3 is a fragmentary side View with the outer shell of the furnacewall broken open to expose certain features of the roof construction. 'tFig. 4 is a fragmentary view somewhat similar to the upper portion ofFig. 1, 4but showing more details,certain parts being in section asindicatedI by the line 4-4 in Fig. 5. l Y

Fig. 5 is a fragmentary plan view of the roof proper and certainassociated parts below the line 5 5 in Fig. 4.

In the present instance, there is shown an upright cylindrical stilldrum 10 supported in the usual manner, and a surrounding cylindricalfurnace wall or shell 11. This Wall 11 consists of a metallic shellproper 12 with a refractory lining 13in the form of a wall of the usualconstruction spaced in'- ward from said shell 12 to afford. a thermo.-insulative dead air space. As'here shown, the still drum 10' extendsabove the refractory lining 13 (and, indeed, alsov above the metallicshell 12), and only the space between wall 11 and drum 10 is roofedover.

VThe refractory roof 15 here illustrated (see, especially,.Figs. 1 andL1) has the form of a flat pitched dome with a large opening in itscenter for the drum 10; in' other words, it is virtually a minor'zone ofa sphere of very large radius. It is also domebuilt in thatcircumferentially adjacent refractory brick composing it divide or abutalong substantiallyror approximately radial planes. As shownv in Figs. 2and 5, indeed,

the brick are arranged both convergently and annularly. Instead,however,of being supported byarching interaction with 'the refractoryyinner'wall or lining 13, this'dome 15 isl supported quite independently,by sus- VVKpension from the overlying and circumjacent frame and shellstructures 16, 12.

As here shown, the roof 15 is composed of ran annular sries of radialrows of brick 17 and 18. The rows 17 are of uniform' width, beingcomposed of standard bung brick (such as .are now inv use-for roofingmetallurgical furnaces) with their undercut heads engaged between curvedrods 19, 19 themselves secure-d at opposite ends yby clamps 20 in theusual manner. These radial bungs 17 are suspendedv at their ends bymeans of hanger rods21 attached to the clamps 20 and=having at theirupper ends lanchor pieces 22 to take over the vertical' anges ofsupporting members23 and l24 consisting of angle bars bent to ring form,one-rather close around the drum 10 and the other inside the shell 12..Thebrick 18 intermediate the bungs 17 rest on the latter, and haveshoulders 25 on their ends "(Fig. 3) for engaging in correspondingrabbets of the bung brick. Thesevbricks 18 are successively shorter andshorter from the outlside inward, so that each row as a Wholel is ofsector-like or triangular shape in plan.

Besides the rings 23 and 24, the supporting structure 16 f comprises apolygonalI frame consisting of I beams 26, 26 resting on the flanged topof the shell 12 and other I beams 27, 27 extending between them. On thesides of the square thus circumscribed around the drum rests the inner pring 23, while the outer ring 24 restson the nitely sealing against thedrum 10. At its outer edge, the roof is sealed with the top of the wallin any suitable manner, as

by a .packing 30` of sand, asbestos. wool faced with crushed fir'ebrickand ireclay, or other material. At its periphery, the roof 15 proper isengaged by arow of inclinedfaced f abutment brick 31-resting on sealingmaterial 32 (suoli as asbestos wool) just outside the topmost shoulderof thel wall 13. lfhe brick 31 are surrounded by a flat metal binderring A33 (here shown as divided into quadrant segments), which serves asa means for holding or crowding the brick 17, 18 convergently togethertoward the drum 10, and for holding the roof 15 in place generally.Inward pressure is exerted on the segments of thering 33 byappropriately located push rods 34, which are yieldingly urged inward byhelical compres-l sion springs 35 in tubular casings 36 themselvessustained .by the circumjacent shell structure 12.l

l claim:

l. ln a furnace of the character described, the combination with anupright drum and a surrounding furnace wall, of a furnace roof aroundsaid dr'um sealed therewith and with said wall, but supportedindependently of either.

2. ln a furnace of thecharacter described, the combination with anupright drumand a wall varound said drum, of a dome-built suspendedrefractory brick roof for their interspace, with means 'for holding ythe brick of said roof convergently together toward the drum. 3. ln afurnace of the character described, the combination with an upright drumand a surrounding refractory wall, of a framework over the interspacebetween them supported independently of said wall, and a refractory rooffor said interspace sealed with dr'um and wall, and composed of bricksuspended from said framework.

4. In a furnace o-f the character described, the combination with anupright drum and a surrounding wall, of a roof for said furnace sealed'with said drum and wall, and comprising an annular series of refractorybungs converging toward said drum and suspended by their inner and outerends.

5. -n a furnace of the character described, the combination with anupright drum, a

surrounding refractory wall, and a `circumjlacent supporting structure,of a polygonal framework circumscribing said drum carried by saidsupporting structure, with inner and outer supporting rings adjacent larefractory 'wall around said drum, of a suspended refractory roof forthe interspace supported independently of thevreholding meanscircumjacent and peripherally engagingsaid roof sustained against itshorizontal thrust independently of said wall.

7 In a fnrnaceof the character described, the combination with an'upright drum and a refractory lined metal shell around said dr'um, 'ofa suspended refractory roof for said furnace around said drum supportedfrom said'shell.

8. A furnace of the character desc'ribed comprising a metal shell and arefractory lining therewithin, a supporting structure carried by saidshell, a dome-built roof of refractory brick suspended lfrom saidstructure within said shell and sealed to said refractory lining, andmeans pushing inward from said shell von the periphery of said roof tohold its brick tightly together.

9. A refractory Yfurnace roof comprising an annular series ofconvergentsuspended rows of bricks.

10. A refractory furnace roof comprising an annular series of convergingsuspended bungs, and intermediate sector-like rows of brick resting onsaid bungs.

11. Av refractory furnace roof comprising a framework with annularsupporting members one within another, and. an annular series of radialbungs suspended from said annular members.

12. .A dome-built refractory furnace roof lil() for yieldingly pushinginward on the latter to crowd the brick together.

13. A refractory furnace roof comprising an annular series ofconvergentrows of suspended brick, a peripherall'y surrounding segmentalbinder ring, and means for exert-A" ing inward pressure on thering'segrnents to hold the brick together.

14:. A circular furnace roof comprising in combination, an overheadsupporting structure, a plurality of radially disposed rows of `brickscarried by said structure, a

segmental ring at the periphery of the rows,

80 fractorywall but sealed therewith, and

ring to hold the bricks in contact with one another during expansionvand contraction of the roof.

15. A circular furnace roof comprising in combination, an overheadsupporting structure, a plurality ot' radially disposed rows of brickscarried by` saidV structure,. and means for yieldingly pressing saidbricks together to maintain them in contact with one another duringexpansion and contraction.

16. Ina furnace roof, a plurality of rows of suspended bricks radiallyarranged, a plurality of rows of intermediate bricks suspended from theformer, and means yieldingly pressing thev bricks together tov maintainthem in Contact With one another during expansion and contraction, thebricks being formed and arranged to constitute a substantially ,circularroof.

In testimony whereof,

I have here'unto signed my name. i

BRADLEY DOBIE.

